San Diego County, San Diego Rat Control Situation:
Hi David, Is a UV blacklight still useful, exterior-wise, if it rains after the rodents leave their urine stains? I am in the process of performing exterior maintenance to better exclude my roof rats. 1) I have a 25 year old cedar shake roof in San Diego California with openings under each shake along the rake edge of the roof at the gable ends of my house. There's no drip edge, i.e. under the shakes I have roofing paper (now somewhat curled) that runs more or less up to and rests right atop the fascia board. Because I have skip sheathing, and since the cross section of a shake is a wedge that is up to one inch at the upper, thick end, this appears to create many huge entry points along the rake edges even though the sheathing is rabbeted into the fascia board. As a result, I'm thinking of getting a UV blacklight to use outside the house to sleuth for urine stains along the upper edge of the gable end shakes and fascia boards. My question is, how easily does the winter rain wash away the urine, rendering this a pointless exercise? 2) I noticed a new product called "rat-out gel" and was thinking of applying it along the rake edges mentioned above. Or, maybe I should just buy many rolls of X-Clude and use that instead. Or maybe both. Any comment? Thanks very much for your website, Doug
My response: First off, I do not have experience using UV lights to detect rat urine. But I do suspect that rain will severely limit the effectiveness of this approach. I have never heard of Rat-Out Gel or XClude, but I typically stick to physical barriers rather than repellent type devices. If your roof makes this impossible, you might have a tough time keeping the rats out.
San Diego Rat Control Tip of The Week
How Do Rats Use Pheromones To Communicate?
Releaser Pheromones:
Rats communicate using releaser pheromones to send information to other rats that they are in their own territory. Rats often urinate in areas to send information that they are ready to nurse or that a specific area where their nest is located is their own. Rats use these releaser pheromones to claim territory and to make sure that other rats will stay away.
Primer Pheromones:
Primer pheromones are designed to be excreted during the peak of fertility and this is the type of pheromone that sends sexual signals to males in the area. These scents are released in order to attract males and to make sure that the female is going to mate during a time where she is more than likely to conceive.
Primer pheromones are some of the main types of communication tools used by rats and it's one of the most powerful ones that can be sensed in the area. These responses are triggered by the area of the brain called the Vomeronasal and this refers to the overall sense that an adult male gets of the pheromone.
Information Pheromones:
These types of pheromones are designed to be useful for identifying something about the animals or about the area. Rats often use these to convey fear or to share information about an area. Certain species of rats can share information about a food source, safe space, and more with these types of pheromones. Most of the time informational pheromones are designed to identify the smell of other species and to warn other rats of dangers in the area.
Scientists are continuing to study rats to determine the total number of ways that they are able to communicate by pheromones alone.
